BRIEF-Facebook introduces new service called 'Marketplace'

* Facebook introduces new service called 'marketplace', to discover, buy and sell items with people in users' community

* Facebook says it will continue expanding 'marketplace' to more countries and make it available on desktop version of Facebook in coming months

* Facebook says over next few days, 'marketplace' will be rolling out to everyone over 18 yrs of age in U.S., UK, Australia, New Zealand on Facebook app Source text (bit.ly/2dxYLqt) Further company coverage: